ENGINEER'S INVENTION. —A new method of tunnelling has been evolved by Mr. B. L. Hamilton, waterworks department field engineer, and has been put into operation on the Waitakere pipeline job where it crosses under the Point Chevalier Road at the junction with Great North Road. By its utilisation no timbering is required for a tunnel, which can stand unsupported for a few hours. Above: The concrete arch being rvheeled on its bottle-jack truck at the ground level. Below: Being hoisted into position in the tunnel. (See letterpress.)
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Auckland Star, Volume LXVII, Issue 141, 16 June 1936, Page 9
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87ENGINEER'S INVENTION.—A new method of tunnelling has been evolved by Mr. B. L. Hamilton, waterworks department field engineer, and has been put into operation on the Waitakere pipeline job where it crosses under the Point Chevalier Road at the junction with Great North Road. By its utilisation no timbering is required for a tunnel, which can stand unsupported for a few hours. Above: The concrete arch being rvheeled on its bottle-jack truck at the ground level. Below: Being hoisted into position in the tunnel. (See letterpress.) Auckland Star, Volume LXVII, Issue 141, 16 June 1936, Page 9
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